On Thu, 29 Aug 2024 21:06:33 +0800 Adrian Huang <adrianhuang0701@xxxxxxxxx> wrote: > From: Adrian Huang <ahuang12@xxxxxxxxxx> > > When running the vmalloc stress on a 448-core system, observe the average > latency of purge_vmap_node() is about 2 seconds by using the eBPF/bcc > 'funclatency.py' tool [1]. > > ... > > 3) The data in column "w/o patch" and "w/ patch" > * Unit: micro seconds (us) > * Each data is the average of 3-time measurements > > System w/o patch (us) w/ patch (us) Improvement (%) > --------------- -------------- ------------- ------------- > 72-core server 2194 14 99.36% > 192-core server 143799 1139 99.21% > 448-core server 1992122 6883 99.65% > Holy cow. I'll add cc:stable to this. Partly because it fixes a softlockup, partly because holy cow.
